Doctor profile · Federal record
Dr. James Ahn, M.D.
Ophthalmology Physician (CMS: Ophthalmology) · Palo Alto, CA
- NPI 1902915028
- Accepts Medicare
- 44 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
795 El Camino Real
Palo Alto, CA 943012302
(650) 321-4121 - Mailing address
-
325 Distel Cir
Los Altos, CA 940221408
Credentials & registration
- NPI registered
- August 2006 — 20 yrs on file
- Profile last updated
- March 3, 2020
- Year of graduation
- 1982 — 44 yrs since
- Specialty taxonomy
- 207W00000X — NUCC code
- State license (1)
- California #G52250
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1902915028. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
200
Distinct HCPCS
5
Medicare allowed
$25,117
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 87 | 78 | $156 | |
92133 |
Imaging of optic nerve | 34 | 31 | $46 | |
92083 |
Exam of visual field with extended testing | 33 | 30 | $82 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 26 | 22 | $111 | |
99215 |
Established patient office or other outpatient visit, 40-54 minutes | 20 | 17 | $218 |
In context: peer comparison
Among 10 peers in this city , average services per provider: 263. This provider delivers 0.8× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
12
Patients
0
Total drug cost
$159
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Timolol Maleate | Generic | 12 | 0 | $159 |
Frequently asked questions
What is Dr. James Ahn's medical specialty?
Dr. James Ahn practices Ophthalmology Physician in Palo Alto, CA.
Where does Dr. James Ahn practice?
Dr. James Ahn practices at 795 El Camino Real, Palo Alto, CA 943012302. Office phone: 6503214121.
What is Dr. James Ahn's NPI?
Dr. James Ahn's National Provider Identifier (NPI) is 1902915028, issued by NPPES.
Does Dr. James Ahn accept Medicare assignment?
Yes. Dr. James Ahn accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. James Ahn commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99214); Imaging of optic nerve (HCPCS 92133); Exam of visual field with extended testing (HCPCS 92083). Source: CMS Medicare Physician & Other Practitioners file.